A sampling optical fiber grating preparing method has the character: the controlling device which the sampling period changes with the altitude direction of the swing mask plate and the duty cycle doesn't change or the duty cycle changes with the altitude direction of the swing mask plate or the sampling periodicity doesn't change, keeps the relative altitude of the sampling swing mask plate and the optical fiber in the process, so it can make the sampling optical fiber grating of different sampling period or the duty cycle by adjusting the relative altitude, also it can make the sampling optical fiber grating of sampling period or the duty cycle changing with the optical fiber axis. So it can decrease the cost and make the complex sampling optical fiber grating. |